Add test for phpstan issue 7396

Author: mvorisek

tests/PHPStan/Analyser/DynamicReturnTypeExtensionTypeInferenceTest.php

@@ -20,6 +20,7 @@ public static function dataAsserts(): iterable
 		yield from self::gatherAssertTypes(__DIR__ . '/data/dynamic-method-return-compound-types.php');
 		yield from self::gatherAssertTypes(__DIR__ . '/data/bug-7344.php');
 		yield from self::gatherAssertTypes(__DIR__ . '/data/bug-7391b.php');
+		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-7385.php');
 	}
 
 	/**

tests/PHPStan/Analyser/data/TestDynamicReturnTypeExtensions.php

@@ -7,6 +7,10 @@
 use PhpParser\Node\Expr\New_;
 use PhpParser\Node\Expr\StaticCall;
 use PHPStan\Analyser\Scope;
+use PHPStan\Analyser\SpecifiedTypes;
+use PHPStan\Analyser\TypeSpecifier;
+use PHPStan\Analyser\TypeSpecifierAwareExtension;
+use PHPStan\Analyser\TypeSpecifierContext;
 use PHPStan\Reflection\Dummy\ChangedTypeMethodReflection;
 use PHPStan\Reflection\MethodReflection;
 use PHPStan\Reflection\ParametersAcceptorSelector;
@@ -18,6 +22,7 @@
 use PHPStan\Type\DynamicStaticMethodReturnTypeExtension;
 use PHPStan\Type\IntegerType;
 use PHPStan\Type\IntersectionType;
+use PHPStan\Type\MethodTypeSpecifyingExtension;
 use PHPStan\Type\NeverType;
 use PHPStan\Type\ObjectType;
 use PHPStan\Type\ObjectWithoutClassType;
@@ -299,3 +304,34 @@ public function getTypeFromStaticMethodCall(
 		return $scope->getType(new New_($methodCall->class));
 	}
 }
+
+class Bug7385MethodTypeSpecifyingExtension implements TypeSpecifierAwareExtension, MethodTypeSpecifyingExtension
+{
+	public function getClass(): string
+	{
+		return \Bug7385\Model::class;
+	}
+
+	public function isMethodSupported(MethodReflection $methodReflection, MethodCall $methodCall = null, TypeSpecifierContext $context = null): bool
+	{
+		return $methodReflection->getName() === 'assertHasIface';
+	}
+
+	/** @var TypeSpecifier */
+	protected $typeSpecifier;
+
+	public function setTypeSpecifier(TypeSpecifier $typeSpecifier): void
+	{
+		$this->typeSpecifier = $typeSpecifier;
+	}
+
+	public function specifyTypes(MethodReflection $methodReflection, MethodCall $methodCall, Scope $scope, TypeSpecifierContext $context): SpecifiedTypes
+	{
+		$type = TypeCombinator::intersect(
+			$scope->getType($methodCall->var),
+			new ObjectType(\Bug7385\Iface::class)
+		);
+
+		return $this->typeSpecifier->create($methodCall->var, $type, TypeSpecifierContext::createNull());
+	}
+}

tests/PHPStan/Analyser/data/bug-7385.php

@@ -0,0 +1,24 @@
+<?php declare(strict_types = 1);
+
+namespace Bug7385;
+
+use function PHPStan\Testing\assertType;
+
+class Model
+{
+	public function assertHasIface(): void
+	{
+		throw new \Error('For static analysis only, $this type is narrowed by MethodTypeSpecifyingExtension');
+	}
+}
+
+interface Iface
+{
+}
+
+function () {
+	$m = random_int(0, 1) === 0 ? new Model() : new class() extends Model implements Iface {};
+	assertType('Bug7385\Model', $m);
+	$m->assertHasIface();
+	assertType('Bug7385\Model&Bug7391\Iface', $m);
+};

tests/PHPStan/Analyser/dynamic-return-type.neon

@@ -39,3 +39,7 @@ services:
 		class: PHPStan\Tests\Bug7391BDynamicStaticMethodReturnTypeExtension
 		tags:
 			- phpstan.broker.dynamicStaticMethodReturnTypeExtension
+	-
+		class: PHPStan\Tests\Bug7385MethodTypeSpecifyingExtension
+		tags:
+			- phpstan.typeSpecifier.methodTypeSpecifyingExtension